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gi inn gtatrs gaunt @f IMPROVEMENT IN LET-OPF-FOR LOOMS.

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Be it known that-I, T.S. SMITH, of Boston, in the State of Massachusetts, have invented a new and useful Improvement in Let-Otis for'Looms, of which the following, with the drawings, isa full description."

Figure 1 is a side elevation.

Figure 2, a. top view. V

-A A is the frame; B, the yarn-beam with gear-wheel; C, the cloth-beam; D, a rocking whip-roll or flat lever, rocking or hearing in the frame cZ d. E and e are a kind of escapement-wheels, having geared pinions b b connected with the gears of the yarn-beam. F is a double friction'clutch brake, operating on the periphery of the escnp ement-wheel E. F is a similar clutch, operating on the outer edges of the escapement-wheel e, the one being a modification of the other. These clutches have two forcep-arms ff and f f, embracing the escapements E and e, and two other extended armsf"- ff, so pivoted that when the extended arms are pressed apart, the fcrcep-arms will grasp or clutch the wheel and stop its motion. Between these extended arms is a wedge-shaped block, G, and in the modification G, to the outer end of which is attached a rod, g, and in the modification g, which is also attached to the shaft d of the flat rocking whip-roll D. No. 1 is a spring, pressing upward the front edge D of D, and in the modification, No. 2 is a spring drawing upon rod 9', and so pressing upward the front edgeD of D. a is a stationary rod or whip-roll, over which the yarn passes from the yarn-beam.

The operation is this: The yarn passing over the flat rocking-bar D, when pulled sufficiently hard will overcome the tension of springs 1 or 2, as one or the other modification is used,-and depress the front-edge D, which will elevate or throw outward the extreme end of rod 9 or g, and-elevate or throw outward the wedgeblocl; G or G, and thus relieve the vheels E or e from the pinch of the clutch F or F. This will permit the wheel to revolve, and the yarn to be given off so far as wanted. As soon as suflicient yarn is given off, the action of spring 1 or 2 will overcome the tension'of the yarn, and the front edge D of D will rise, and rod 9 or g will press wedge-block G or G down between the extended armsff orff, and cause the forcep-arms ff or f f to clutch the wheels E or e, and stop the deliveryof the yarn; D g, D g, forming a lever of which d is the fulcrum. The relative position of the arms may be altered and adjusted by a set-screw, 01.

By crossing the arms of the clutch, the pressure of the yarn may be made to operate from the whip-roll the wheel.

' directly upon the wedge-block, and by forcing it down between the extended arms, cause the forceps to clutch What I claim in let-oti' for looms and yarns, is-

1. The double-arm clutch, constructed, arranged, and-operating substantially as do of the clutch is loosened by the pull or tension of the yarn, substantially as set forth.

2. The lever Dy, in combination with the clutch, when arranged and operating substantially as described.

3. The combination of lever, clutch, andspring, substantially as and for the purposes described.

4. The combination oflever, wedge-block, clutch, and spring, substantially asund for the purposes described.

5.' The combination of whip-roll, wedge-block, and cross-arm clutch, substantially as and for the purposes scribed, when the grasp described.

In testimony whereof, I have hereunto subscribed my name.

T. S. SMITH. Witness es:

W. M. PARKER, A. B.-ELY. 

